Paul nordmann



(No Model.)

P. NORDMANN. EQUALIZER FOR ROTARY CURRENT SYSTEMS- Patented July 11 DINVENTOH l fwdmw VATTORNEY.

W/TNESSES. Maw

Unrrnn STATES PATENT Orrrcn.

PAUL NORDMANN, OF BERLIN, GERMANY, ASSIGNOR TO SIEMENS & l-IALSKE, OFSAME PLACE.

EQUALIZER FOR ROTARY CURRENT SYSTEMS.

SPECIFICATION forming part of Letters Patent No. 501,094, dated July 11,1893.

Application filed February 23, 1892. Serial No. 422,581 (No model.)

To all whom it may concern: to be operated by multiphase currents, the

Beitknown thatLPAULNORDMANN, asubcoils of which are shown as in multipleof ject of the King of Prussia, residing at the pairs of the conductors.They may be concity of Berlin, Kingdom of Prussia, Germany, nected inseries.

have invented certain new and useful Im- E indicates myimprovedequalizing device,

provements in Equalizers for Rotary Current of which two forms are shownin the draw- Systems; and I do hereby declare the followings, 2'. e.,the ring form, shown in Figs. 1 and ing to be a full, clear, and exactdescription 2; and the columnar form, shown in Figs. 3 of the invention,such as will enable others and l. The ring form, shown in Figs. 1 and loskilled in the art to which it appertains to 2, consists ofahighlylaminated metalliccore make and use the same. I, upon which is wound aclosed coil K. The

Myinvention relates to apparatus designed ring form of my equalizer issubstantially to be employed in connection with a multisimilar inconstruction to a Gramme-ring. phase current system of electricdistribution, In Fig. 1, the equalizer is shown as con- 15 and consistsof a device which has for its obnected to the main conductors to b 0,through -ject to maintain the potential of the currents the conductors ef g, which are respectively in the several circuits of the system alike,in connected at equidistant points, A B O. In respective of the workdone in the individual Fig. 2, the construction is similar to Fig. 1,circuits. with the exception that three separate coils 20 My inventionfurther relates to the meare wound upon the ring and connected atchanical construction of the regulating or one end to a common point D.In each of equalizing device itself. the figures, the coils or divisionsof coils of In the accompanying diagrams, which serve the equalizer, areshown as corresponding to to explain my invention, similar letters ofthe number of current phases, or currents 25 reference indicate likeparts. transmitted from the generator. It will,

Figure 1 is a diagram indicating a generatherefore, be understood thatif more than tor of multiphase currents, a multiphase disthree phases orcurrents are used, the numtributing system, with lamps, an electro-moberof coils or divisions of coils will corretor, and my equalizing deviceconnected in spond.

30 multiple of the several conductors. Fig. 2 In Figs. 3 and 4:, theequalizing device conindicates a generator, a multiphase distribsists ofa number of columnar laminated uting system, including a multiphasetranscores 1', united at their tops and bottoms by former, with lamps,and my equalizing device rings 1 so as to form closed magnetic cores.connected in series. Figs.3 and 4 are eleva- Upon these cores are placedcoils K. The

35 tions showing modifications of the equalizing points A B O, in Figs.3 and 4, correspond to device, Fig. 3 showing the coils arranged in thepoints A B O, in Figs. 1 and 2. 4 series and Fig. 4, in multiple. Theoperation of my improved equalizer is In the drawings, G represents agenerator as follows: If multiphase current motors reof multiphasecurrents of any well known quiring at least three phases of amultiphase40 type, and a b c, conductors leading from the current, or threeseparate currents, are to be generator, and corresponding in number withused in the same system with lamps which the number of phases of thecurrent or sepaare fed from a single current, it is necessary ratecurrents transmitted from the generator. to provide some means forequalizingthe cur- In Fig. 2, the conductors a Z) care shown as rentpotential transmitted through the sev- 45 connected in a well knownmanner to a muleral conductors, to compensate for variations tiphasetransformer T. in load in the separate conductors. If, in a sys- L arelamps, shown in Fig. l,asin multiple tem of multiphase distribution, agroup of of a pair of the conductors; and in Fig. 2, in lamps, fed by asingle current, should be sudseries. denly cut into or out of circuit,the potential of 5c M is an electro-lnotor of the type adapted thecurrent in the feeding main conductor to the group will be changed fromthat flowing in the other conductors, and if this feeding current, aswell as others,is used to energize a m ultiphase current motor at thesame time, the potential of the currents fed to the motor will beunequal, and the motor will not do its work properly. Now, supposingthat the potential of the currents traversing each conductor of thesystem is the same, and each of these conductors are connected in asuitable manner to my improved equalizing device,'no magnetization ofthe core of the equalizing device will take place,as in multiphasesystems, the sum of all the currents at any moment is algebraicallyequal to naught. If, however, the potential of the current in one of themains connected to the equalizer should be varied, in the mannerpreviously set forth, or in any other manner, the coil upon theequalizer connected to that main would receive more or less current thanthe other coils, depending upon the change of potential of the main. Ifthe potential of the current transmitted to such coil be less than thatreceived by the other coils upon the equalizer, the equalizer would thenassume the function of a transformer,that is to say, the coil or coilsreceiving the highest potential will become primary coils, and the othercoil or coils, secondary coils. The magnetization of the core by theprimary coil or coils will inductively produce secondary currents in thesecondary coil; and this action, occurring in the equalizer, will ineffect restore the normal balance between the potential of the currentsin the different conductors of the system, and also serve to regulatethe periodicity of the phases of the transmitted currents, should the periods of said phases be altered by disturbing influences, in anyone ormore of the circuits of the system.

I have described myimproved system as carried outwith a multiphasesystem of three conductors. It will be clearly understood by those towhom the specification is addressed, that any number of conductors maybe employed, corresponding to the number of phases of the currentgenerator.

Having thus described my invention, I claim 1. The combination with amultiphase system of distribution comprising three or more wirescarrying three or more currents of different phase, of an equalizerconsisting of an inductional apparatus, substantially as described,whereby energy may be transferred from such portion or portions of thesystem having a potential above the normal, to such portion or portionsof the system having a potential below the normal.

2. An equalizer for multiphase current systems, comprising a laminatedcore, said core having a coil wound thereon, divided into as manysections as there are current phases, said sections connected insuccessive order to the main line conductors, substantially asdescribed.

In testi mouy whereof I have affixed mysignature in presence of twowitnesses.

PAUL NORDMANN. Witnesses:

BROR HEMMING WEssLAU, MAX WAGNER.

